We've fitted the regulator with a PTFE-faced valve - this is a routine job we do for engines that come in with leaking regulators; the replacement valve providing both an effective seal and also a much lighter, smoother action which makes driving a nicer experience (Connor is our regulator expert - he'd just finished machining one up and fitting it to the 7 1/4 inch gauge Duchess that went out last week when the Ruston landed on his bench).